NIU Actions: More specific permissions error codes

The user must enable two different Assistant permissions for the NIU Actions feature to function. Previously, a single error code was sent if either permission was missing. Now a different code is sent depending on which permission is missing, allowing Google Go to better direct the user to the proper setting.

Bug: 191109150
Test: Manual (Pixel 3A)
Test: m -j RunLauncherGoGoogleRoboTests
Change-Id: Id301ffddf36b992b5722c52ccc6e597e003942dd